Fuel injection pump



' May l1, `1937. R. E. OLIN FUEL INJECTION PUMP Filed Jan. 5l. 1955 a Z W W9 2 ff@ w j v .L l Tllulillim i! 4 f l 70,/ mw v n 4 A ,o 3

Patented May 11, 1937 n UNITED STATES PATENT OFFICE F'UEL INJECTION PUMP Robert E. lin, Canton, Ohio, assignor to The Timken Roller Bearing Company, Canton, Ohio, a corporation of Ohio Application January 31, 1935, Serial No. 4,215

4 Claims. (Cl. 10S-41) My invention relates to fuel injection pumps inder with an overflow passageway I9 that comof the kind wherein the quantity of fuel delivmunicates with an overflow port 20 located in ered by the pump is controlled by rotary adjustsaid cylinder opposite the inlet port I8 therein. ment of the reciprocating pump plunger or pis- The inlet port I8 and the overflow port 20 are 5 ton. The invention has for its principal object preferably disposed at different levels. The pump 5 to provide a simple, eicient, compact and ecoplunger or piston 8 is of the general type pronomical arrangement for rotatably adjusting the vided with a recessed portion 2l having an inpump plunger. The invention consists in the clined wall and communicating through a pefuel injection pump and in the parts and comripheral recess 22 with the compression chamber 10 binations and arrangements of parts hereinafter of the cylinder, whereby the effective feed stroke l0 described and claimed. of the plunger may be regulated by varying the In the accompanying drawing, which forms angular position thereof.

part of this specification and wherein like sym- The mechanism for rotatably adjusting the bols refer to like parts Wherever they occur, pump plunger 8 comprises a sleeve 23 mounted Fig. 1 is a central vertical section through a in the upper end of the enlarged lower portion i5 fuel injection pump embodying my invention, the of the vertical bore I and provided along a porpump plunger being shown at the end of its suction of its periphery with teeth 24 adapted to tion stroke; and cooperate with the teeth of a rack 25 mounted Fig. 2 is a side elevational view of a regulating in a longitudinal recess in said housing. The sleeve and the plunger cup. driving sleeve 23 is held i-n place by means of a 20 Referring to the accompanying drawing, my screw 26 that is threaded through the wall of invention is shown in connection with a fuel inthe housing I and has a reduced inner end porjection pump comprising a housing I provided tion that extends within a peripheral recess 21 with a vertical bore 2 having an enlarged lower in said driving sleeve. Mounted in the tappet end portion, within which is slidably mounted cup 3 is a plunger cup 28 that has a driving 25 a tappet cup 3 which is forced upwardly inthe engagement with the lower portion of the plungbore by means of a cam or tappet 4 mounted on er comprising a squared or atsided portion 29 a cam shaft 5 located in an enlarged bottom on the plunger that ts a similarly shaped openchamber E communicating with the lower end of ing through the bottom of said plunger cup. The

30 said enlarged bore A pump cylinder 1, which plunger cup 28 also has a driving engagement 30 contains a plunger or piston 8, has an enlarged with the driving sleeve 23, as by means ci, hes collar portion 9 seated on an annular shoulder 38 in said sleeve that straddle upward;V f. I0 provided therefor in the upper 0r Smaller poring tongues 3| on said p1unger cup. 'nic plungtion of the vertical bore 2. er cup 28 rests upon an enlarged head portion 32 Mounted in the vertical bore 2 above the cylformed on the lower end of the plunger and pro- 35 inder 'I is a tubular member Il provided at its vided with a spherical end face that is held in lower end with a base flange Ila, which seats engagement with the bottom of the tappet cup `against the Upper end 0f Said cylinder and at 3 by means of a coil spring 33 mounted within its upper end with a seat for a fuel discharge the adjusting sleeve 23 and plunger cup 28 with 40 valve I2. Threaded into the upper end of the its upper end bearing against the top of the en- 40 bore 2 iS a tubular tting 01' 51181143, Which holds larged lower portion of the bore I and with its the valve seat Il against the DllmDvCylinder 1 lower end bearing against an annular spring and iS DIOVided at its Upper end With a space for seat 34 sleeved on the plunger inside said plunger a coil spring I4 that normally holds the fuel cup,

discharge valve I2 against said seat. A fuel dis- The above described construction is very sim- 45 charge pipe l5 has a conical end lJOltiOn l5 Seatple and provides an effective means for rotata- V ed in a bevel seat provided therefor in the upbly adjusting the pump plunger. The tappet cup per end of the tubular ttins I3 and held in pohas ne direct connection with the pump plunger SitiOn by means 0f a Cap |511 threaded 0n the 0r with the mechanism for oscillating said plungupper end 0f Said tubular fitting. er and is thus adapted to be removed and re- 50 The'housing I is provided with a passageway placed without disturbing these parts. 'I'he drive I1, which receives liquid fuel from a feed pump sleeve and plunger cup enclose the spring and (not shown) and communicates with an inlet are in turn mounted in the tappet cup, thus proport I8 in the wall of the cylinder 1. The housviding a very simple and compact arrangement ins is provided 0n the opposite side of the cylof parts. The retaining screw holds the drive 55 sleeve upwardly in the housing, while the engagement between the upper end of the tappet cup and the lower end of the drive sleeve serves to maintain the drive sleeve concentric with the bore in which itis mounted.

Obviously, the hereinbefore described arrangement admits of considerable modification without departing from the invention. Therefore, I do not wish to be limited to the precise arrangement shown and described.

What I claim is:

1. A fuel injection pump comprising a housing, a cylinder therein, a plunger reciprocable in said cylinder and projecting therebelow, a tappet cup slidably mounted in said housing concentric with said plunger and cooperating with the lower end thereof, a tappet for actuating said tappet cup, a sleeve rotatably mounted in said housing concentric with said plunger with its lower end extending into said tappet cup, means for oscillat ing said sleeve, a plunger cup mounted in said tappet cup, said sleeve and said plunger cup having cooperating portions permitting relative axial movement but preventing relative rotary movement, said plunger cup and said plunger having cooperating portions preventing relative rotary movement thereof, and a spring mounted in said .sleeve and said plunger cup for retracting said plunger, said tappet cup and said plunger cup.

2. A fuel injection pump comprising a housing, a cylinder therein, a plunger reciprocable in said cylinder and projecting therebelow, a tappet cup slidably mounted in said housing concentric with said plunger and cooperating with the lower end thereof, a tappet for actuating said tappet cup, a sleeve rotatably mounted in said housing concentric with said plunger with its lower end extending into said tappet cup, means for oscillating said sleeve, a screw threaded through said housing with its inner end engaging said sleeve to hold the same upwardly in said housing, a plunger cup mounted in said tappet cup, said sleeve and said plunger cup having cooperating tongue and notch portions permitting relative axial movement but preventing relative rotary movement, said plunger cup and said plunger having cooperating portions preventing relative rotary movement thereof, and a spring mounted in said sleeve and said plunger cup for retracting said plunger, said tappet cup and said plunger cup.

3. A fuel injection pump comprising a housing, a cylinder therein, a plunger reciprocable in said cylinder and projecting therebelow, a tappet cup slidably mounted in said housing concentric with said plunger and cooperating with the lower end thereof, a tappet for actuating said tappet cup, a sleeve rotatably mounted in said housing concentric wth said plunger with its lower end extending into said tappet cup, means for oscillating said sleeve, removable means for holding said sleeve upwardly in said housing, a plunger cup mounted in said tappet cup, said sleeve and said plunger cup having cooperating portions permitting relative axial movement but preventing relative rotary movement, said plunger cup and said plunger having cooperating portions shaped to prevent relative rotary movement thereof, a spring seat sleeved on said plunger inside of said plunger cup, and a spring mounted in said sleeve and said plunger cup with its upper end in engagement with said housing and with its lower end in engagement with said spring seat.

4. A fuel injection pump comprising a housing, a cylinder therein, a plunger reciprocable in said cylinder and projecting therebelow, a sleeve rotatably mounted in said housing concentric with said cylinder and provided with a plurality of downwardly opening circumferentially spaced elongated notches, a cup member secured at its bottom to the projecting lower end of said plunger with its side wall extending upwardly around said plunger in endwise alinement with the` lower end of said sleeve,said side wall of said cup member being notched to form a plurality of circumferentially spaced tongues that extend upwardly into the downwardly opening notches in said sleeve andA form an axially slidable but nonrotatable connection between said sleeve and said cup member, and a tappet cup reciprocable in said housing with its bottom in abutting relation to the lower end of said plunger and with its side wall extending upwardly around said cup member in contact with the notched side wall thereof and with the notched portion of said sleeve.

' ROBERT E. OLIN. 

